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The uppercase letter Η is used as a symbol in textual criticism for the Alexandrian text-type (from Hesychius, its once-supposed editor). In chemistry , the letter H as symbol of enthalpy sometimes is said to be a Greek eta, but since enthalpy comes from ἐνθάλπος, which begins in a smooth breathing and epsilon, it is more likely a ...
Arrow (symbol) § Arrows in Unicode; Mathematical operators and symbols in Unicode; Wikipedia:Manual of Style (mathematics) For more on special characters: Unicode character name index can be used to find the Unicode number of a character. W3C list of MathML characters indexed by code or name
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name.
For other symbols, such as the arrow, star, and heart, there isn’t a direct keyboard shortcut symbol. However, you can use a handy shortcut to get to the emoji library you’re used to seeing on ...
eta: angular jerk: radian per second cubed (rad⋅s −3) energy efficiency: unitless (dynamic) viscosity (also ) pascal second (Pa⋅s) theta: angular displacement: radian (rad) kappa: torsion coefficient also called torsion constant newton meter per radian (N⋅m/rad)
Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.
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Click on a group name (e.g., Symbols) to display that group; click on the image of the appropriate character to enter that character at the current cursor position in the edit window. Some of the images of different characters are very similar in appearance, so it is important to use the correct image.